I see a number of dust boots have a hole that the bit goes

General CNC CNC Routers
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1

I see a number of dust boots have a hole that the bit goes through and I got curious. Does this have a side effect of helping the bit stay cool?

2

technically yes, but I doubt it would be very effective!

3

I would think the dust boot would require special accommodations for lube or water hoses if you use them.